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The IMPACTON Project: Pole and Shape of Eight Near-Earth Asteroids

  • José Sergio Silva (a1), Daniela Lazzaro (a1), Teresinha Rodrigues (a1), Jorge Márcio Carvano (a1), Fernando Roig (a1), Roberto Souza (a1) and the IMPACTON team (a1)...

Abstract

The formation and evolution of Solar System small bodies, in particular those in near-Earth orbits, is a complex problem which solution strongly depends on a better knowledge of their physical properties. To contribute to the international efforts in this direction the IMPACTON project (www.on.br/IMPACTON) set up a dedicated facility denominated Observatório Astronômico do Sertão de Itaparica (OASI). Using the 1-m telescope several dozens of NEAs were observed between March 2012 and October 2014. Here we will present the results obtained for 8 objects. Relative magnitudes were used to obtain lightcurves and derive rotational periods. Applying the inversion method developed by Kaasalainen and Torppa (2001) and Kaasalainen et al. (2001), along with lightcurves from literature, allowed to refine the rotational period of these asteroids as well as to derive their pole direction and shape. The obtained results confirm a lack of poles toward the ecliptic and with a majority of retrograde rotators. A more representative sample, however, is needed in order to drive robust conclusions.

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Footnotes

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Based on observations obtained at the Observatório Astronômico do Sertão de Itaparica - OASI, Itacuruba, Brazil

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References

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Durech, J., Sidorin, V., & Kaasalainen 2011, A&A, 513, A46
Hanus, J., Durech, J., Broz, M., Warner, B. D., Pilcher, F., Stephens, R., Oey, J., Bernasconi, L., Casulli, S., Behrend, R., Polishook, D., Henych, T., Lehký, M., Yoshida, F., & Ito, T 2011 A&A, 530, A134
Harris, A. W., Young, J. W., Bowell, E., Martin, L. J., Millis, R. L., Poutanen, M., Scaltriti, F., Zappala, V., Schober, H. J., Debehogne, H., & Zeigler, K. W. 1989 Icarus, 77, 171
Jahn, J and Kretlow, M. 2014 Minor Planet Bulletin, 41, 67
Kaasalainen, M. & Torpa, J. 2001 Icarus, 153, 24
Kaasalainen, M., Torppa, J., & Muinonen, K. 2001 Icarus, 153, 37
LaSpina, A. Spina, A., Paolicchi, P., Kryszczyska, A., & Pravec, P. 2004 Nature, 428, 400
Silva, J. S. 2015 PhD Thesis, Publicacões do Observatório Nacional, Rio de Janeiro
Warner, B. D. 2014a Minor Planet Bulletin, 41, 41
Warner, B. D. 2014b Minor Planet Bulletin, 41, 113
Warner, B. D. 2014c Minor Planet Bulletin, 41, 157
Warner, B. D. 2014d Minor Planet Bulletin, 41, 213
Warner, B. D. 2015 Minor Planet Bulletin, 42, 115
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